Author: kib
Date: Fri Feb 7 22:21:44 2020
New Revision: 357668
URL: https://svnweb.freebsd.org/changeset/base/357668
Log:
linux futex_put(): do not touch futex after dropping our reference.
Reported and tested by: Steve Roome <m...@stephenroome.com>
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/compat/linux/linux_futex.c
Modified: head/sys/compat/linux/linux_futex.c
==============================================================================
--- head/sys/compat/linux/linux_futex.c Fri Feb 7 21:57:27 2020
(r357667)
+++ head/sys/compat/linux/linux_futex.c Fri Feb 7 22:21:44 2020
(r357668)
@@ -329,9 +329,9 @@ futex_put(struct futex *f, struct waiting_proc *wp)
f->f_key.shared);
LINUX_CTR3(sys_futex, "futex_put uaddr %p ref %d shared %d",
f->f_uaddr, f->f_refcount, f->f_key.shared);
- FUTEXES_UNLOCK;
if (FUTEX_LOCKED(f))
futex_unlock(f);
+ FUTEXES_UNLOCK;
LIN_SDT_PROBE0(futex, futex_put, return);
}
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